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Oracle Database cannot return results to a user process in parallel.If a query returns a large number of rows, execution of the query might indeed be faster.you typically have predicates, so they can benefit from fast lookups, even though the maintenance of the index negatively affects the performance; it is a trade-off that has to be evaluated carefully by the developer.
A trigger is fired based on a triggering statement, which specifies: statement might include a list of columns.Alternatively, you can make your index unusable (i.e. Predicates show up in execution plans as access, index filter, or table-level filter predicates.An access predicate corresponds to the start and stop conditions of the leaf node traversal.Hints let you make decisions usually made by the optimizer.As an application designer, you might know information about your data that the optimizer does not know.
To avoid I/O bottlenecks, specify a tablespace that is striped across at least as many physical disks as CPUs.